1) double-tube core barrel
双筒取心筒
2) core barrel of double tubeswivel type
双层取心筒
3) double-tube core barrel,swivel type
内筒不转式双筒取心筒
4) double-tube core barrel ,rigid type
内筒转动式双筒取心筒
5) double core barrel drill
双筒取心钻具
6) core shoe
取心筒鞋